2
WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Learning Objectives By attending this session, participants will: Understand the difference between the thermal boundary and the air or pressure boundary, and the behavior and function of each Know the proper location of the pressure and thermal boundaries Know common sites for breaks in the pressure and thermal boundaries Understand what is meant by inside and outside in terms of air barrier, and how a blower door is used to determine that 2 PRESSURE & THERMAL BOUNDARIES

3
WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Thermal & Air Barriers For maximum efficiency and comfort, the thermal and air barriers must be continuous and in contact with each other. PRESSURE & THERMAL BOUNDARIES 3

26
WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Where Is the Air Barrier? Cape Cod 1½ Story House 26 PRESSURE & THERMAL BOUNDARIES

27
WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Where Is the Air Barrier? 27 Pressure difference of the floor cavity with reference to the house should be 0 Pa. But, is it? PRESSURE & THERMAL BOUNDARIES

28
WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Where Is the Air Barrier? 28 Targeted air sealing defines air barrier PRESSURE & THERMAL BOUNDARIES

29
WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Where Is the Air Barrier? 29 Pressure and thermal boundaries are now aligned PRESSURE & THERMAL BOUNDARIES

30
WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Summary For maximum efficiency and comfort, the thermal and pressure boundaries must be continuous and in contact with one another Electrical and mechanical chases, missing top plates, knee walls and dropped ceilings are common trouble spots Pressure diagnostics determine location and condition of air barrier Zonal pressure readings in conditioned spaces should read close to 0 WRT inside Targeted air sealing defines the pressure boundary 30 PRESSURE & THERMAL BOUNDARIES